Stabilized reference current or reference voltage source

摘要

A circuit supplying a stabilised voltage (Vref) which is insensitive to variations of the supply voltage (Vcc) and of the temperature, comprises a cell of four transistors. The first two transistors have their bases and collectors cross-coupled, and the first transistor has its emitter coupled to the reference voltage (VEE) by a resistor and has an emitter area larger than the emitter area of the third transistor. A fifth transistor has an emitter connected to the collector of the fourth transistor and a base which is driven by a line via a resistor. This line is coupled to the supply voltage via a current source. This resistor has a value between 2 and 4 times that of a compensation resistor coupled between the third transistor and the line. Preferably, a capacitance is connected between the bases of the second and the fifth transistor. The circuit is useful as a reference voltage source in integrated circuits where the supply voltage is afflicted with noise.